linux-kernel - Re: [PATCH v1 2/2] fbdev: Kconfig: Add HAS_IOMEM dependency for FB

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Date:   Fri, 26 Jan 2018 14:38:29 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Thomas Huth <thuth@...hat.com>,
        Farhan Ali <alifm@...ux.vnet.ibm.com>,
        <linux-kernel@...r.kernel.org>, <linux-s390@...r.kernel.org>,
        <linux-fbdev@...r.kernel.org>
CC:     <schwidefsky@...ibm.com>, <borntraeger@...ibm.com>,
        <stefan.kristiansson@...nalahti.fi>
Subject: Re: [PATCH v1 2/2] fbdev: Kconfig: Add HAS_IOMEM dependency for
 FB_OPENCORES

On 26/01/18 14:33, Thomas Huth wrote:
> On 25.01.2018 16:47, Farhan Ali wrote:
>> The Opencores framebuffer device uses I/O memory and with
>> CONFIG_HAS_IOMEM disabled will lead to build errors:
>>
>> ERROR: "devm_ioremap_resource" [drivers/video/fbdev/ocfb.ko] undefined!
>>
>> Fix this by adding HAS_IOMEM dependency for FB_OPENCORES.
>>
>> Signed-off-by: Farhan Ali <alifm@...ux.vnet.ibm.com>
>> ---
>>  drivers/video/fbdev/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
>> index 5e58f5e..8667e5d 100644
>> --- a/drivers/video/fbdev/Kconfig
>> +++ b/drivers/video/fbdev/Kconfig
>> @@ -976,7 +976,7 @@ config FB_PVR2
>>  
>>  config FB_OPENCORES
>>  	tristate "OpenCores VGA/LCD core 2.0 framebuffer support"
>> -	depends on FB && HAS_DMA
>> +	depends on FB && HAS_DMA && HAS_IOMEM
>>  	select FB_CFB_FILLRECT
>>  	select FB_CFB_COPYAREA
>>  	select FB_CFB_IMAGEBLIT
> 
> I think it would be better if fbdevs in general would depend on
> HAS_IOMEM ... or could there be any frame buffer devices without IOMEM ?

There are some small ones which are updated with, say, i2c
(ssd1307fb.c). I think those don't need iomem.

 Tomi

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